Log Message:
Patch setup.py to implement PKGMANDIR and remove the associated
post-install phase to better handle man page installs. Bump revision
due to the patch addition although PLIST should remain unaffected.

Add the unittest command for do-test (as documented by the project).

Modify DESCR to better reflect that it also supports Ed25519 headers,
which is the main interest of py-dkim.